Electric switch



Jufiy 3231i, 1925. 1,5410%9 c. E. ANDERSON ELECTRIC SWITCH Filed June 11, 192.4

glam 1 4 INVEN TOR.

C451 ER/C HNLM'RS o A! A TTORNEYS.

lntented duly ill, i925.

i or who CARL ERIC ANDERSOlTl, OF STPWh'I'I'llERD, CONNECTICUT, ASSIGNOR TO THE BRYANT ELEGTRKC COMPANY, F HEIDGEJEORT, CUNNECI'ICUT, A CORPORATION 01 (film'- nncrrour.

nnno'rnro swrront.

Application tiled June 11, 19%.

T 0 all whom it may concern Be it known that l, CARL Enro ANnnnsoN,

of the momentary contact type, and particularly by means of appliances which may be utilized to transform a. standard switch construction for this purpose.

lo. the accompanying drawings- Fig. l is a broken plan of a switch in which my invention is embodied in one form; Fig. 2 is a section on the line 2--2, Fig. 1; end

Fig. 3 is as section on the line 33, Fig. 2. A. switch of the momentary contact type is particularly useful in hospital signal'systems, where it is desirable to provide means by which the patient may momentarily open or close a. circuit to operate a cell signal. While suchuse of the resent switch is particularlycontemplated y me, the application of the features of novelty of construction to switches for other uses, or in switches other than the flush type shown, will be obvious to any one dealing with the matter.

As illustrated, my invention is embodied in a. flush toggle switch comprising at eupshaped insulating body 15 sdapted to be mounted in an outlet box (not shown) by means of the centrally epertured rigid supporting yoke 16 whichextends longitudinally across the open face of the cup-shaped body, and is secured thereto by means of end screw bolts 17. The switch frame, in which the moving parts of the switch mechanism are mounted, is provided by the spaced parallel wings 18 integral with the yolre and offset t'rom opposite side margins of the latter. Mounted to oscillate on the frame after the fashion disclosed in my copending application filer. No. 509,242, filed October 21, 1921, are the forked operating lever 19 and the switch bar yoke 20 interconnected by the toggle spring 21 straddled by the lever to etiect the snap throw of the switch Serial No. 719,395.

bar carrier. I have shown a switch of the single-pole double-break type, with but a single pair of switch contacts 22 end a single switch bar 23 carried by the yoke 20. It will be obvious that it a double-pole arrangement be desired, a duplication of the contacts and switch bar on the opposite side of the mech anism may be provided as shown in my epplication above mentioned.

Mounted upon the insulating thumb piece 19 of the operating lever 19 is e sheet metal bracket- 24, provided with a countersunk perforated seat for the reception of a. lrnot in the end of a pull cord 25, by which the lever may be thrown in one direction. 'llo shift the switch lever in opposite direction, ll pro vide a return spring 26, one end of which is anchored to the lug 27 struck inward from the supporting yoke 16, while the other end iitl is attached in any suitable way td. the rock i lever 19, above the anchorage tor the switch spring 21. For this purpose l have shown an anchor clip 28 posing through c hole 29 in the lever 19 and engaged by the hooked end of the return spring 26. It is obvious that upon the swing of the lever 19 by pull on the cord 25, the stress on spring 26 is increased and is sulhcient to automatically return the lever to its original position upon release of the pull cord.

In the construction shown, the throw of the switch, upon operation of the pull cord 25, is to open circuit position. ll the sig nal system is such that a momentery closure of the circuit is desired, it is only nec- 19 must be manually shifted in both directions to make or break the circuit. The

presence of the anchor hole 29 in the lever 19, and otthe anchor lugs 2'3, on the yolre 16 in no way aflects the mechanism for operation in this fashion, when the return spring 26 and its pull cord 25 are absent. These features may therefore be incorporated as standard features of construction, by which,

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-the cover plate on the addition or" the return spring 26, bracket 24.- and cord 25, the type of switch may be readily changed.

Certain features of improvement in details of the switch mechanism are also indicated. Thus, while the. rock lever 19 is normally held in its open bearing 31 in the frame 18 by the stress of the spring 21, it has been possible heretofore to pull the lever outward sufiicientlv to unseat it from the bearing and to displace it laterall and thus dcrange the mechanism. To prevent this I provide a locking plate 32 of thin sheet metal which is mounted on the. inner face. of the frame 18 (after the assembl ot' the switch mechanism thereon) and overlies the laterally projecting lug 323 of the lever suf- .iicientl closely to prevent the complete displacement of the leve" out of its open bean In the construction shown in my eopending application above referred to, the throw of the operating lever is halted by the ends of the opening in the yoke 16 through which is passes. l. have found it preferable to limit its throw by means of studs 3t proiecting inward -from one of the side members of the frame 18 to which they are riveted.

A combined indicator and cover sheet 35 is provided, which prevents the entry of dust and dirt into the switch chamber through the opening 36 in the cover plate 5? through which the handle 15) of the operating lever passes. The sheet is an hanged. between the supporting yoke 16 and 37, and is apertured to accommodate the handle 19". On the throw of" the lever 19 the plate shifts acrss the opening 36, but it is of sufiicient extent to close the letter at all times. At appropriate points on opposite sides of; the handle 15 legencs 38 are provided which are exposed t .rou 'i tu epening'36, and disclose the con- I the sa 'itch. The rectangular shape oi the handle 1.9 and the opening in the prevents angular displacement of he meet and. serves to maintain it in. proper position. Itis supported at its opposite side margins upon the upper surface of the side walls of the cup-shaped body 15.

'nditications in details of structure will readily occur to those skilled in the art, which do not depart from which I claim as iuv invention.

I claim 1. In an electric switch, a sulating body, asupporting yoke extending across the open face of the body. a switch mechanism arranged within the chamber of the body and cmnpnisinpj an operating rock lever. together with a return spring anchored at one end to the rock lever and at its other end to the supporting yoke and tending constantly to thrm the lever in one direction.

.2. in an electric switch, an operatingrock lever forked to straddle a switch bar operating spring and having an anchorage adjacent the crotch ot the fork for said spring, said lever having a second anchorage, spaced from said'crotch ot the fork, for a return spring.

3. in an electic switch, a supporting yoke,

cup-shaped inapertured between its ends to permit the play of a switch operating rock lever, and provide between said lever-Way and the end of the yoke with an anchorage for a return spring adapted to be engaged between said lever and yoke.

t. In an electric switch mechanism, a switch frame having an open bearing, a roclt lever freely pivoted in said open bearingand means rigid with the frame for preventing the escape of the lever from'said bearing. 7

5. in an electric switch mechanism, a switch frame having an open bearing, a rocl; lever freely pivoted in said open hearing. and a loclt plate attached to the frame and overlying the entrance to the open bearing therein to prevent the escape of the rock lever therefrom.

'In testimony whereof l have signed my name to this specification.

CARL EH10 ANDERSON. 

